What----you want to open your return and mess with it to see about making estimated payments based on "income assumptions?"? No. Do not mess with your filed and accepted tax return, or you will make a mess that will keep you from being able to transfer it accurately for your 2020 return next year. Or if it turns out you need to amend it for some unforeseen reason, you will have a messed up return to work with. Try the tax caster tool for your income predictions.
https://turbotax.intuit.com/tax-tools/calculators/taxcaster/
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**